--- id: CVE-2023-4806 title: A flaw has been identified in glibc summary: >- A flaw has been identified in glibc. In an extremely rare situation, the getaddrinfo function may access memory that has been freed, resulting in an application crash. This issue is only exploitable when a NSS module implements only the … severity: medium cvss: 5.9 cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H' cwe: - CWE-416 - CWE-416 vendor: gnu product: glibc affected: - glibc = 2.33 - codeready_linux_builder_eus = 9.2 - codeready_linux_builder_eus_for_power_little_endian = 9.0_ppc64le - codeready_linux_builder_eus_for_power_little_endian_eus = 9.2_ppc64le - codeready_linux_builder_for_arm64 = 9.0_aarch64 - codeready_linux_builder_for_arm64_eus = 9.2_aarch64 - codeready_linux_builder_for_ibm_z_systems = 9.0_s390x - codeready_linux_builder_for_ibm_z_systems_eus = 9.2_s390x - enterprise_linux = 7.0 - enterprise_linux = 8.0 - enterprise_linux = 9.0 - enterprise_linux_eus = 8.8 - enterprise_linux_eus = 9.2 - enterprise_linux_for_arm_64 = 9.0_aarch64 - enterprise_linux_for_arm_64_eus = 9.2_aarch64 - enterprise_linux_for_ibm_z_systems = 8.0_s390x - enterprise_linux_for_ibm_z_systems_eus = 8.8_s390x - enterprise_linux_for_ibm_z_systems_eus_s390x = 9.2 - enterprise_linux_for_ibm_z_systems_s390x = 9.2 - enterprise_linux_for_power_little_endian = 8.0_ppc64le - enterprise_linux_for_power_little_endian = 9.2_ppc64le - enterprise_linux_for_power_little_endian_eus = 8.8_ppc64le - enterprise_linux_for_power_little_endian_eus = 9.2_ppc64le - enterprise_linux_server_aus = 9.2 - >- enterprise_linux_server_for_power_little_endian_update_services_for_sap_solutions = 9.2_ppc64le - enterprise_linux_tus = 8.8 - fedora = 37 - fedora = 38 - fedora = 39 published: '2023-09-18' updated: '2026-07-14' source: NVD sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2023-4806' references: - url: 'https://access.redhat.com/errata/RHSA-2023:5453' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2023:5455' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2023:7409' label: secalert@redhat.com - url: 'https://access.redhat.com/security/cve/CVE-2023-4806' label: secalert@redhat.com - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2237782' label: secalert@redhat.com - url: 'http://www.openwall.com/lists/oss-security/2023/10/03/4' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'http://www.openwall.com/lists/oss-security/2023/10/03/5' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'http://www.openwall.com/lists/oss-security/2023/10/03/6' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'http://www.openwall.com/lists/oss-security/2023/10/03/8' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/errata/RHSA-2023:5453' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/errata/RHSA-2023:5455' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/errata/RHSA-2023:7409' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/security/cve/CVE-2023-4806' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2237782' label: af854a3a-2127-422b-91ae-364da2661108 - url: >- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4DBUQRRPB47TC3NJOUIBVWUGFHBJAFDL/ label: af854a3a-2127-422b-91ae-364da2661108 - url: >- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/DFG4P76UHHZEWQ26FWBXG76N2QLKKPZA/ label: af854a3a-2127-422b-91ae-364da2661108 - url: >- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/NDAQWHTSVOCOZ5K6KPIWKRT3JX4RTZUR/ label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://security.gentoo.org/glsa/202310-03' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://security.netapp.com/advisory/ntap-20240125-0008/' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://cert-portal.siemens.com/productcert/html/ssa-082556.html' label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e - url: 'https://cert-portal.siemens.com/productcert/html/ssa-831302.html' label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e tags: - nvd epss: 0.01606 epssPercentile: 0.7484 ingestedAt: '2026-07-14T14:37:02.323Z' --- ## Overview A flaw has been identified in glibc. In an extremely rare situation, the getaddrinfo function may access memory that has been freed, resulting in an application crash. This issue is only exploitable when a NSS module implements only the _nss_*_gethostbyname2_r and _nss_*_getcanonname_r hooks without implementing the _nss_*_gethostbyname3_r hook. The resolved name should return a large number of IPv6 and IPv4, and the call to the getaddrinfo function should have the AF_INET6 address family with AI_CANONNAME, AI_ALL and AI_V4MAPPED as flags. ## Affected - `glibc = 2.33` - `codeready_linux_builder_eus = 9.2` - `codeready_linux_builder_eus_for_power_little_endian = 9.0_ppc64le` - `codeready_linux_builder_eus_for_power_little_endian_eus = 9.2_ppc64le` - `codeready_linux_builder_for_arm64 = 9.0_aarch64` - `codeready_linux_builder_for_arm64_eus = 9.2_aarch64` - `codeready_linux_builder_for_ibm_z_systems = 9.0_s390x` - `codeready_linux_builder_for_ibm_z_systems_eus = 9.2_s390x` - `enterprise_linux = 7.0` - `enterprise_linux = 8.0` - `enterprise_linux = 9.0` - `enterprise_linux_eus = 8.8` - `enterprise_linux_eus = 9.2` - `enterprise_linux_for_arm_64 = 9.0_aarch64` - `enterprise_linux_for_arm_64_eus = 9.2_aarch64` - `enterprise_linux_for_ibm_z_systems = 8.0_s390x` - `enterprise_linux_for_ibm_z_systems_eus = 8.8_s390x` - `enterprise_linux_for_ibm_z_systems_eus_s390x = 9.2` - `enterprise_linux_for_ibm_z_systems_s390x = 9.2` - `enterprise_linux_for_power_little_endian = 8.0_ppc64le` - `enterprise_linux_for_power_little_endian = 9.2_ppc64le` - `enterprise_linux_for_power_little_endian_eus = 8.8_ppc64le` - `enterprise_linux_for_power_little_endian_eus = 9.2_ppc64le` - `enterprise_linux_server_aus = 9.2` - `enterprise_linux_server_for_power_little_endian_update_services_for_sap_solutions = 9.2_ppc64le` - `enterprise_linux_tus = 8.8` - `fedora = 37` - `fedora = 38` - `fedora = 39` ## Remediation Refer to the linked advisories for vendor-supplied fixes and affected version ranges.